Hi Ana, and welcome to the forum.

First thing your bf is going to have to do is to contact the closest Portuguese consulate - for KY, that is probably in Chicago - to inquire about visa requirements. There may be some information on the Internet (try googling "Portuguese Embassy US").

Beware of having him move over and THEN ask about visas and jobs. Chances are that he will have to apply for his initial visa from his home country - and a visa application usually takes "a few" months. But that gives him a bit of time to at least start learning the language. It will be very difficult for him in Portugal if he doesn't speak enough Portuguese for at least day-to-day transactions.

Good luck with his move - it will take some time, but in the long run it's better to do it right the first time.
Cheers,
Bev